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wangchengdong
faf864b04f
Signals in NuttX serve two primary purposes:
1. Synchronization and wake-up:
Signals can be used to block threads on specific signal sets and later
wake them up by delivering the corresponding signals to those threads.
2. Asynchronous notification:
Signals can also be used to install callback handlers for specific signals, allowing threads to
asynchronously invoke those handlers when the signals are delivered.
This change introduces the ability to disable all signal functionality to reduce footprint for NuttX.
Signed-off-by: Chengdong Wang wangchengdong@lixiang.com
115 lines
3.4 KiB
C
115 lines
3.4 KiB
C
/****************************************************************************
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* libs/libc/spawn/lib_psa_init.c
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sched.h>
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#include <spawn.h>
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#include <assert.h>
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#include <errno.h>
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#include <nuttx/sched.h>
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: posix_spawnattr_init
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*
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* Description:
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* The posix_spawnattr_init() function initializes the object referenced
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* by attr, to an empty set of spawn attributes for subsequent use in a
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* call to posix_spawn() or posix_spawnp().
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*
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* Input Parameters:
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* attr - The address of the spawn attributes to be initialized.
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*
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* Returned Value:
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* On success, these functions return 0; on failure they return an error
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* number from <errno.h>.
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*
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****************************************************************************/
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int posix_spawnattr_init(posix_spawnattr_t *attr)
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{
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struct sched_param param;
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int ret;
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DEBUGASSERT(attr);
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/* Flags: None */
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attr->flags = 0;
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/* Set the default priority to the same priority as this task */
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ret = _SCHED_GETPARAM(0, ¶m);
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if (ret < 0)
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{
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return _SCHED_ERRNO(ret);
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}
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attr->priority = param.sched_priority;
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/* Set the default scheduler policy to the policy of this task */
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ret = _SCHED_GETSCHEDULER(0);
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if (ret < 0)
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{
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return _SCHED_ERRNO(ret);
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}
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attr->policy = ret;
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/* Empty signal mask */
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#ifndef CONFIG_DISABLE_ALL_SIGNALS
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sigemptyset(&attr->sigmask);
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#endif
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#ifdef CONFIG_SCHED_SPORADIC
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/* Sporadic scheduling parameters */
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attr->low_priority = (uint8_t)param.sched_ss_low_priority;
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attr->max_repl = (uint8_t)param.sched_ss_max_repl;
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attr->repl_period.tv_sec = param.sched_ss_repl_period.tv_sec;
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attr->repl_period.tv_nsec = param.sched_ss_repl_period.tv_nsec;
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attr->budget.tv_sec = param.sched_ss_init_budget.tv_sec;
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attr->budget.tv_nsec = param.sched_ss_init_budget.tv_nsec;
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#endif
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/* Default stack size */
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attr->stacksize = CONFIG_POSIX_SPAWN_DEFAULT_STACKSIZE;
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#ifndef CONFIG_BUILD_KERNEL
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attr->stackaddr = NULL;
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#endif
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return OK;
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}
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